Hoshizaki TM-500AAE, Service Manual

Page: 43 / 65

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minutes while the Compressor is running, and stops icemaking operation. “E1” will appear
in the Display Window.
9) Thermistor
The code “EA” (Water Temperature Thermistor) or “Eb” (Condenser Center Thermistor) will
blink in the Display Window if the Thermistor circuit detects infinite resistance (open circuit
or bad contact).
10) Float Switch
The Float Switch or connector may have a bad contact if the Float Switch trips at the upper
float level but not at the lower float level with the Flush Water Valve closed. “E2” will
appear in the Display Window.
11) High Pressure Switch
Operates at a high condensing pressure when the icemaker has a clogged Air Filter or a
dirty Condenser. “E4” will appear in the Display Window when the Pressure Switch trips
once (floor mounting) or five times within an hour (fixed mounting).
9. ERROR CODES
Interlock Errors
Code Error Condition Operation Reset Check/Repair
E1
Abnormal Ice
Production
During Compressor
operation, Float Switch trips
at upper float level for 10
minutes.
Whole unit
stops.
Press
Reset
Button.
Float Switch,
Control Water Valve
not closing,
Refrigeration circuit,
Gas leak, Freeze
E2
Float Switch
Error
Float Switch trips at both
upper and lower float levels
for 2 seconds.
Whole unit
stops.
Press
Reset
Button.
Float Switch
E4
Abnormal
High Side
Pressure
High Pressure Switch trips
once (floor mounting) or 5
times in 1 hour of
Compressor operation
(fixed mounting).
Whole unit
stops.
Press
Reset
Button.
Fan Motor,
Refrigeration circuit,
Condenser
clogged, Installation
conditions
E9
Abnormal Low
Side Pressure
During Compressor
operation, Low Pressure
Switch trips for 5 seconds.
“E9” appears immediately
(floor mounting) or after 2
repetitions (fixed mounting).
Whole unit
stops.
Press
Reset
Button.
Miswiring, Gear
Motor Magnet
Switch or Relay
Replace Controller
Board.
EA
Water Inlet
Thermistor
Circuit Open
Water temperature stays
below -50°C for 1 second.
Fan control
stays at full
speed. Heater
control is OFF.
Press
Reset
Button.
Water Inlet
Thermistor